National Park Service St. Croix National Scenic Riverway - Osceola Backscatter, 20191016

The U.S. Geological Survey (USGS) collected hydroacoustic data of the St. Croix River adjacent to the Osceola (WI) boat ramp for hydrographic and benthic mapping...美国地质调查局（U.S. Geological Survey, USGS）针对毗邻威斯康星州（WI）奥斯西奥拉船艇坡道的圣克罗伊河河段，采集了用于水文与底栖测绘的水声数据……